Thanks! I did have paper rolls in the bigger tank for them (along with a bunch of other hides), but didn't think to block off the end with paper towels. I currently have two of the mini RB hides in his separate tank but am still looking to provide more, tinier hides for him so he can feel as safe as possible. 3 out of 4 sides are blocked off completely from view (put cardboard and Styrofoam up against the outsides). I think he still hasn't eaten yet unfortunately. One guppy is missing, but it probably just flopped off somewhere again - I didn't want to disturb him to check.

I am going to buy one of the "fancy" danios again after work as that is what inspired him to eat the first time while the guppies don't seem to be doing anything for him. I'll pick up some more fake plants while I'm there. I have some ordered but they won't arrive until Wednesday and I don't want to steal them from the other babies. They're still doing well. I'm really hoping I can fix the problem for this one.